Colour and coloration

Question 0

4 ways in which dyes are bonded to a fibre

Answer 0

Iconic bonding
Covalent
Hydrogen
Van der waals

Question 1

What are two important variables when dyeing?

Answer 1

Temperature and ph of the dyebath

Question 2

Boiling point of a acid dye

Answer 2

100 oc

Question 3

What are three classifications of drugs

Answer 3

Synthetic cellulosic protein fibres

Question 4

Acid dyes (protein and nylon fibres

Answer 4

When the ph is above 5, the fibre becomes a positive charge

Ph of water is adjusted with acid which is an negative charge, overall neutral

Question 5

What charge is an acid dye

Answer 5

Neutral

Question 6

Direct dyes (cellulosic)

Answer 6

Due is a long flat molecular shape, slots in the spaces.
Dyebath is negative
Direct dyes are negative
Sodium is added to make the fibre neutral

Question 7

What is added to make direct dyes neutral

Answer 7

Sodium (salt)

Question 8

What charge is the dyebath and the dyes

Answer 8

Both negative

Question 9

Reactive dyes

Answer 9

Same as direct expect an alkali is added at the end which creates a chemical reaction

Question 10

Disperse dyes

Answer 10

Polyester dyes are hydrophobic need to be dyed with the same characteristics

Question 11

What is the building temperature of direct dyes (polyester)

Answer 11

130o

Question 12

Techniques used for dying

Answer 12

Batiq ikat, shibori silk screening etc